Rock bolt



FIG. 1 is a perspective view of the rock bolt according to the present invention, shown broken away to indicate an indeterminate length.

FIG. 2 is a top plan view of the rock bolt of FIG. 1 according to the present invention; and,

FIG. 3 is a perspective view of a portion of the rock bolt according to the present invention. 

The ornamental design for a rock bolt, as shown and described. 